Immunological tolerance to muscle autoantigens involves peripheral deletion of autoreactive CD8+ T cells.

PloS One
Emilie FranckSahil Adriouch

Abstract

Muscle potentially represents the most abundant source of autoantigens of the body and can be targeted by a variety of severe autoimmune diseases. Yet, the mechanisms of immunological tolerance toward muscle autoantigens remain mostly unknown. We investigated this issue in transgenic SM-Ova mice that express an ovalbumin (Ova) neo-autoantigen specifically in skeletal muscle. We previously reported that antigen specific CD4(+) T cell are immunologically ignorant to endogenous Ova in this model but can be stimulated upon immunization. In contrast, Ova-specific CD8(+) T cells were suspected to be either unresponsive to Ova challenge or functionally defective. We now extend our investigations on the mechanisms governing CD8(+) tolerance in SM-Ova mice. We show herein that Ova-specific CD8(+) T cells are not detected upon challenge with strongly immunogenic Ova vaccines even after depletion of regulatory T cells. Ova-specific CD8(+) T cells from OT-I mice adoptively transferred to SM-Ova mice started to proliferate in vivo, acquired CD69 and PD-1 but subsequently down-regulated Bcl-2 and disappeared from the periphery, suggesting a mechanism of peripheral deletion. Peripheral deletion of endogenous Ova-specific cells was formally de...Continue Reading

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Citations

Aug 13, 2015·Molecular Therapy : the Journal of the American Society of Gene Therapy·Romain HardetSahil Adriouch
Jan 10, 2014·The Journal of Immunology : Official Journal of the American Association of Immunologists·Katelyn T ByrneMary Jo Turk

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Methods Mentioned

BETA
transgenic
flow cytometry
FACS
X-ray

Software Mentioned

FlowJo Star
Prism
GraphPad

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